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CaSO4
Orthorhombic
Anhydrite, a calcium sulfate mineral of the barite group, was first reported from Franklin by Palache (1928a, 1935) as a pale bluish white, granular core of a small 25mm nodule in marble. This anhydrite was bordered by gypsum and, in turn, by sussexite and by serpentine. According to Frondel (1972) it was later found in some abundance. Frondel also reported an occurrence at Sterling Hill as white granular material associated with gypsum in calcite.
Coarsely crystallized anhydrite has three directions of cleavage at right angles, a vitreous luster, and no discernible fluorescence in ultraviolet. A specimen labeled from Franklin has 1 cm crystals associated with calcite, sphalerite, and willemite.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
to homepage
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This
page created: January 11, 2001 |
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